When Detective Mortimer Shade is somehow killed in a freezer, a parasite called a grail possesses his body, revives him, but he needs blood to stay alive. His partner John Dark accepts the new situation and together they become vigilantes, judging and killing the bad guys, with Shade sucking their blood with his claw. However, Dark notes that Shade is losing the rest of his humanity and becoming a monster, being aware and afraid of the danger Shade represents to mankind and trying to stop him.

故事关于一群才华横溢的年轻学生们在一次科学实验中取得了突破性成功：创建了一个无线神经网络，并通过量子计算机能够连接到人类思维。通过这项技术，人类终于能够首次实现真正的知识能力共享，比如能将某个人具备的运动技能转移到另一个人身上。这群年轻人决定免费推广该技术，将其视作实现知识自由与人类平等的重要前提。但他们很快发现，他们自身因此成为一个更大更险恶的实验的一部分。黑暗势力随之登场，并威胁要利用这一技术实现对人类群体的控制。

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主人公考兹是一个很神秘的枪手。因为身为修女的母亲，当初背叛了对上帝的誓言私自生下他，使得考兹一直背负着诅咒：每一个死于他枪下的人都会重新复活。不久，被考兹杀死的一伙人，以恶人坎撒为首，都复活过来找他寻仇。为了应付这种局面，考兹也给自己找了一个名叫范布鲁斯的年轻勇士一起并肩战斗……